Practical organic chemistry / by Julius B. Cohen.

  • Cohen, Julius B. (Julius Berend), 1859-1935.
Date:
1908
Catalogue details

Licence: Public Domain Mark

Credit: Practical organic chemistry / by Julius B. Cohen. Source: Wellcome Collection.

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    air. They are decomposed by water more or less rapidly, and give the corresponding acid and hydrochloric acid, which may be tested for. They are also acted on rapidly by strong ammonia, and give the amide, the melting-point of which may be ascertained (p. 209). Halogen Acids and Esters.—Most of the insoluble halogen acids belong to the aromatic series, and have a distinctive melting-point. For further confirmation, they may be converted into the acid chloride and amide. Insoluble esters containing halogens may belong to both series, and the acid and alcohol must then be separated and separately investigated. 4. The following among the more common organic substances contain sulphur or sulphur and nitrogen in addition to carbon, hydrogen and oxygen. Insoluble Substances. (Containing C, H, and S or C, H, O, S, and N.) Melting- Boiling-1 Melting- Boiling- point. point. point. point. Sulphides— Allyl sulphide . . — 140 Thiocyanates— Benzyl ,, . . 49 — Allyl thiocyanate . — 151 Sulphonic Acids— Sulphobenzoic acid decornp. Phenyl „ (p. 160) .... — 222 Sulphanilic acid (p. Thioamides— x75) .• *. • •. • • Naphthionic acid . ” ” — Thiocarbamide (p. 128). i75 |3-Naphthylamine Thiocarbanilide (p. sulphonic acid . /3-Naphthylamine n 159). i5t - disulphonic acid . R acid . . p ” — Sulphonamides— 5 5 Benzenesulphon- Or „ . . j j amide (p. 179) 150 — Sulphates— Benzenesulphonani- Methyl sulphate . — 187 lide (p. 179) . . no — Ethyl ,, 208 Mixtures.—A preliminary investigation carried out as described on p. 322 will determine roughly if the substance is a mixture. Before proceeding to identify the substances present, it is essential that they should first be separated. This may be a long and difficult operation, but the following methods may lead to the desired result. If the substance cannot be satisfactorily separated byfractional